Reliability of HVDC and MVDC Electrical Asset: The Challenge of Insulation Design

G. Montanari, R. Ghosh, H. Naderiallaf, P. Seri
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引用次数: 2

Abstract

Reliability of DC electrical asset components has not been investigated as broadly as for sinusoidal AC supply. On the other hand, DC assets are more and more common, and they are forecasted to grow in number, power, and voltage in the near future. This is not only in transmission grids, but also in distribution/generation (renewables), industrial application and electrification transportation. To complicate the framework, it has to be recognized that DC asset components are not only subjected to DC steady-state voltage, but also to voltage and temperature transients, as those coming from energization, voltage polarity inversion, ripple, repetitive voltage impulses and load variations. The major issue to asset component reliability can come, in these conditions, from electrical insulation. While designing insulation under AC sinusoidal voltage is a century-long practice, with many feedbacks from field installations, the same does not hold for modulated sinusoidal (i.e., power electronics) and DC supply. Electrical stresses can be different in magnitude and distribution from AC to DC, and load variations in DC can contribute to electric stress variations much more than in AC. All of this may impact significantly on aging rate and reliability of electrical insulation.This paper investigates the difference between electric field distribution, and consequent aging mechanisms and rate, from AC sinusoidal to DC supply, considering, in particular, the real DC operating conditions during which voltage and load transients can occur frequently. The contribution of partial discharges to aging rate will be also taken into account, bringing to the derivation of a probabilistic life model that can allow reliability estimations in the design of DC insulation systems to be achieved.
高压直流和MVDC电气设备的可靠性:绝缘设计的挑战
直流电气资产组件的可靠性还没有像正弦交流电源那样得到广泛的研究。另一方面,直流资产越来越普遍,预计在不久的将来,它们的数量、功率和电压都将增长。这不仅适用于输电网,还适用于配电/发电(可再生能源)、工业应用和电气化运输。使框架复杂化的是,必须认识到直流资产组件不仅受到直流稳态电压的影响,而且还受到电压和温度瞬变的影响,如通电、电压极性反转、纹波、重复电压脉冲和负载变化。在这种情况下,资产组件可靠性的主要问题可能来自电气绝缘。虽然在交流正弦电压下设计绝缘是一个长达一个世纪的实践,有许多来自现场安装的反馈,但对于调制正弦(即电力电子)和直流电源来说,情况并非如此。在交流和直流之间,电应力的大小和分布可能不同,直流负载变化对电应力变化的影响要比交流大得多。所有这些都可能对电绝缘的老化速度和可靠性产生重大影响。本文研究了从交流正弦电源到直流电源的电场分布及其老化机制和速率的差异,特别考虑了实际直流运行条件下电压和负载瞬变可能频繁发生的情况。还将考虑局部放电对老化率的贡献,从而推导出一个概率寿命模型,该模型可以实现直流绝缘系统设计中的可靠性估计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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